Malicious PDF — malware analysis report

Static analysis result for SHA-256 67e5661843acc56b…

MALICIOUS

PDF

87.9 KB Created: 2021-09-12 17:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 84c875103e6c9a0b4035020eca18eb01 SHA-1: 4ef57d19cb382c11230e89ba5fd04bbb66991a4a SHA-256: 67e5661843acc56b68b0d84398ac274565fd1278d388210a0fa9d0c6ee8fc5ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding numerous URLs that point to other PDF files hosted on various domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests these domains are likely disposable and used for malicious purposes, potentially to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://igabana.com/upfolder/e/files/20210907015121.pdf In PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/8999030609.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/94474308649.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/viwovutonuvurul.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/73048441040.pdfIn PDF document text
    • http://stefani.cz/fck/file/68916135492.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/59930908211.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/lipitejogekakivujutemi.pdfIn PDF document text
    • http://neteyes.eu/editor_up/wevavepigexigekizogup.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/49587479047.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/barakefijefigipaka.pdfIn PDF document text
    • http://sial.pl/galeria/file/lamodedaxero.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/savim.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/dofowalixofupezoz.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/95326515574.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/96b40eca553a724338af07f6bef8e890/4104774556.pdfIn PDF document text
    • http://tiquital.com/documentos/file/21519731235.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/timuruwezomepufubogow.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/wiwov.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/75282233036.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/72914174122.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613925aa7c17d---jukerimig.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/zipimowidimilekan.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/15119865517.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/pisikiwasepov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+tower+defencePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 17160 bytes
SHA-256: 118dc3f922fcde28e573ea784410e72b3296ca970f4cc023708fc99ac37d2723
font_01_sfnt_off00012348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12348 10160 bytes
SHA-256: 796cd54666c058d806c715a373be84a41f3698ee910ea09c130fffde387dc857
font_02_sfnt_off00013a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1